茉莉花间谍document.execCommand不叫

Question

我写了一个这样的测试

describe('execCommand', function () {
    it('should call document.execCommand', function () {
        spyOn(document, 'execCommand').and.callThrough();
        expect(document.execCommand).toHaveBeenCalledWith('foreColor', false, 'red');
        document.execCommand('foreColor', false, 'red');
    });
});

但是Expected spy execCommand to have been called with [ 'foreColor', false, 'red' ] but it was never called.失败了，我不知道为什么？

请帮帮忙。

注意:我使用grunt-contrib-jasmine 0.9.2运行它。

Answer 1

Jasmine的expect函数当时是一个断言，而不是一个将在it块末尾运行的断言，请切换顺序以确保它正常工作：

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describe('execCommand', function () {
  it('should call document.execCommand', function () {
    spyOn(document, 'execCommand').and.callThrough();
    document.execCommand('foreColor', false, 'red');
    expect(document.execCommand).toHaveBeenCalledWith('foreColor', false, 'red');
  });
});

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